does any one have a hard vacuum line digram for a 2.8. or does any one know where i can get replacement hard vaccum lines, besides the junkyard.

 

Karl (KED85) had posted pics of my 85 diagram, pretty sure your 87 IS different.

AZ/Advance Auto has the lines (skinny ones) in a semi-bulk pack, in the HELP section iirc.

 

Go to a dealership. They will have a diagram and vaccum lines.

 

So all the vacuum is one size fits all? i have the slightest clue how to replace these, and they seriously need replacing...

 

The vacume signal harness for the 2.8 third gen F-car is no longer available from the GM dealer. Go to the HELP section at advance auto buy the bulk lines and fabricate your own.

 

Any of the parts stores will have everything that you will need to make a new vaccum system.

 

here you go this is for 86-89


http://www.autozone.com/az/cds/en_us...rInfoPages.htm This is the page that has all the years. I hope this helps.
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I went to a salvage yard and found the lines off of a 3.1 and they worked. I had to make a few changes but over all they are fine. When I had to make a bend I used a lighter to heat the tube up and then cooled it off with cold water to harden it up fast. I even had to cut the hard lines and then I spliced them back with tubing and it works fine, no leaks.

 

HI IVE GOT ALL COMPLETE ORIGINAL, 2.8 V6 HARD VACUME LINES IN EXCELLENT SHAPE FROM AN 87 FIREBIRD YOU CAN HAVE THEM FOR 35 BUCKS INCLUDES S&H
LET ME KNOW IF INTERESTED

 

On the topic of hard vaccum lines: what's the point? Why not have all rubber and save yourself from the possibility of snapping them?

 

I think that the hard lines are a larger inner diameter. For a flexable one to be that but of diameter the rubber would be thicker so it doesn't buckle. Thats what I would think.